Gun



ZJOLOSS 5 Sheets-Sheet l me@ 7 E937 w. T. MOORE GUN Filed April 14, 1934a :banana: :2.5:

Inventur A'vvilEy-'lMmm@ y h/W/MZ Attmrne Dec. 7, H937. w. T. MOORE GUNFiled April 14.. 1934 5 Sheets-Sheet 2 @All 27 Inventur vM/WWMW MLV Dec.7 1937. w, MOORE 2,101,086

GUN

Filed April 14, 1934 5 Sheets-Sheet 5 la ll $5 @D /07 /23 /oa //5 794 97/0 /40 .f6 /I es A Y ivg 'e' 5A @um 'ff/A [02 [/5 /B `93 /07 /06 /05 S7H6. 99 /20 /5-5 wila T Mnnre Atturney EHIE W. T. MOORE GUN Filed April14, 1934 5 Sheets-Sheet 4 T EZEEA- Inventur Willa 'T'-Mumr'e @JMW/@MAttnr'ne Dec. 7,' 1937. w 1', MOQRE 2,101,086

GUN

Filed April 14, 1934 5 Sheets-Sheet 5 70 /ls /90a cmn/ Inventur Wiley TMnnre Patented Dec. 7, 1937 UNITED STATES Wiley T. Moore,

GUN

United States Army, Wright Field,

Ohio

Application April 14, 1934, Serial No. 720,625 1s claims. '(01. ss-z)(Granted under the act of March 3, 1883, as amended April 30, 1928; 3700. G. 757) The invention described herein may be manufactured and usedby or for the Government for I governmental purposes, without thepayment to me of any royalty thereon.

This invention relates to a gun.

The purpose of the invention is to provide a light and compact machinegun composed of a minimum number of parts and capable of performing theloading operation by pushing a cartridge forwardly out of a link belt.

The gun is characterized by a novel breechlocking mechanism havingautomatic head-space adjustment with uniform loading pressure, by afeeding mechanism which may be conveniently and quickly reversed toprovide for feeding of a cartridge belt from left to right or from rightto left, and by a novel firing and trigger mechanism.

With the foregoing and other objects in view, the invention resides inthe novel arrangement and combination of parts and in the details ofconstruction hereinafter described and claimed it being understood thatchanges in the precise embodiment of the invention herein disclosed maybe made within the scope of what is claimed without departing from thespirit of the invention.

A practical embodiment of the invention is illustrated in theaccompanying drawings, wherein:

Fig. 1 is a view in left side elevation of the improved gun.

Fig-2 is an enlarged view in left side elevation of the breech end ofthe gun, parts being shown in section.

Figs. 3 and 4 are sectional views of the gas operating mechanism.

Fig. 5 is a sectional view on the line 5-5 of Fig. 1.

Fig. 6 is a plan view of the gun.

Fig. 7 is a plan view of the receiver with the cover rem'oved andshowing the breech bolt in locked position.

Fig. 8 is a plan view of the receiver with a portion of the coverremoved and with parts in section and showing the breech bolt inposition of 45 recoil.

Figs. 9 and 10 are enlarged plan views of bolt locking mechanismrespectively in locking and unlocking position.

Figs. 11 and 12 are general longitudinal sec- 50 tional views with thebolt respectively in battery and in recoil.

Figs. 13 and 14 are transverse sectional views showing the extremepositions of the cartridge belt feed lever.

5:, Fig. 15 is a sectional view on the line I 5-I5 of Fig. 7.

Figs. 16 and 17 are respectively views in end elevation and in plan ofthe cover for the receiver.

Fig. 18 is a sectional view on the line I8-,I8

60 0f Fig. 17.

Fig. 19 is a plan view of the actuating slide.

Fig. 20 is a longitudinal sectional view of the slide.

Figs. 21, 21A, and 21B are detail views of the hammer.

Figs. 22 and 22A are detail views of the sear.

Figs. 23 and 23A are detail views of the extractor.

Fig. 24 is a view partly in elevation and partly in section of thecartridge stop.

Fig. 25 is a plan view of a belt link.

Fig. 26 is a detail view showing the relation between the sear andhammer.

Fig. 27 is a transverse sectional view on the line 21-21 of Fig. 10,showing the relation between the sear and sear actuating plunger.

Figs. 28, 28A and 28B are detail views of the reinforcing and ejectorplate for the cover of the receiver.

Fig. 29 is a perspective view of the sear actuating plunger.

Figs. 30, 30A, 30B and 30C are detail views of the locking levers of thebreech bolt.

Fig. 31 is a bottom plan view of the cover plate of the feedway.

Fig. 32 is a view in elevation of the cartridge holding spring.

Referring to Figs. 1 and 11 to 14 there is shown a receiver A comprisingspaced side plates 5-5 and a bottom plate 6 integrally joined at theirforward ends by a trunnion block 'I carrying trunnions 8. The block isformed with a threaded aperture for receiving the breech end of a gunbarrel I 0.

The barrel is tightly fitted in a casingI II (Fig. 6) formed of a metalsuch as aluminum having a capacity for rapidly dissipating heat. 'I'herear end of the casing includes a steel plate I2 secured by screws I2a(Fig. 2) and engaging the front face of the trunnion block. The underportion of the casing II is formed with a channel or passage I3 forhousing a slide. I4 which extends rearwardly through an aperture I5 inthe plate I2 and through an aperture I6 in the trunnion block and rideson the bottom plate 6 of the receiver between the side plates 5--5. Abottom cover I1 slidably mounted in grooves I8 in the casing I I andclosing the passage is provided with a spring finger I 9 having aprojection 20 for engaging in a recess 2| in the under face of thetrunnion block.

A piston 22 (Figs. 1, 3, and 4) attached to the front end of the slideI4 works in a cylinder 23 which is mounted in the casing II and in avalve block 24 xed to the gun barrel adjacent its muzzle. 'I'he valveblock serves in the usual manner of gas-operated guns. to conduct gasfrom a port 25 in the barrel to the cylinder where it is available todrive the piston and slide rearwardly. A spring 26 confined between afront seat 2'Lln the piston and a rear seat 28 carried by the plate I2serves to restore the piston and slide to their normal forwardpositions.

A handle 29 for manually retracting the slide is protided 'with a head3o adapted to ride in opposite grooves 3I -3I in the bottom plate 6 ofthe receiver. A plunger 32 mounted in the handle is normally urgedupwardlj7 by a spring 33 to engage a shoulder 34 in the slide I4. Thehead 30 is provided with a recess 35 for-receiving a projection 36 on aspring finger 31 secured to the rear end of the cover I1. By virtue ofthis connection with the cover the handle 29 does not normallyreciprocate with the slide I4 when the slide is gas operated.

A breech bolt 38 (Fig. '1) for closing the breech of the gun barrel isdisposed within the receiver. The bolt is formed with recessed sidesadjacent its front end to accommodate a pair of locking levers 39--39adapted to swing outwardly into pockets or recesses 40-40 in the sidewalls of the receiver when the bolt is in battery. Each of the lockinglevers 39 isv formed with a slot 4I (Figs. 9, 30 and 30A) in its frontend for receiving an apertured ear 42 on the bolt. A pivot pin 43 passesthrough the lever and the apertured ear.

On the under side of each lever there is a crank arm 44 having a camslot 45. The crank arms of the two levers are in different planes andoverlap so that a stud 46 on the slide I4 is disposed with a loose t inthe cam slots 45 of both crank arms. The stud 46 is on lthe longitudinalcenter line of the slide and midway between the pivots 43 of the lockinglevers.

As shown in Fig. 9 when the breech bolt is in battery the stud 46 is atthe front end of the cam slots 45 and the levers 39 are moved outwardlyinto the recesses 40 of the receiver. When the breech bolt is inretracted position as seen in Fig. the stud 46 is at the rear end of thecam slots and the levers are disposed in the recesses of the bolt andwithin the side plates 5-5 of the receiver.

The levers 39 are each formed at their outer ends with an ecentriccurved face 41 (Figs. 9

and whose center indicated by the point 48, when the lever is in theopen or out position, is located midway between the pivot 43 and thelongitudinal vertical center plane of the bolt and in the planecontaining the axis of the pivots 43 of both locking levers. Therecesses of the receiver are formed with complementary curved faces46-49. 4

The levers 39 are in the nature of oating eccentrics, it being assumedthat the center 48 of the curved face 41 while turning through a smallarc will remain at the point center of the locking faces, thediscrepancies from this assumption being taken up by the fact that thestud 46 has a loose t in the cam slot and enables the locking lever tocenter itself.

The amount or degree of outward rotation of the locking levers 39 willbe dependent on the final in battery position of the breech bolt.

In the present arrangement the levers 39, due to the camming action ofthe stud 46 on the crank arms 44, will lock the bolt in various inbattery positions through a range of approximately .04 inch head-spaceadjustment, the head-space being the distance between the front face ofthe breech bolt and the cartridge seating cone 50 of the chamber of thegun barrel. The length of the cartridge case 5I between its base andeaftin cone is variable and of course controls the final position of thebreech bolt.

In guns not having an automatic head-space adjustment the variations inhead-space result in stoppages because of failure in functioning of thebreech lock and the sear mechanism or due to rupture and stretching ofthe cartridge case. In case of excessive head-space, even though therebe no actual rupture of the case, a severe pounding action results,which is injurious to the mechanisms of the gun. The provision of theautomatic head-space adjustment insures locking of the bolt in variablein battery position and a uniform loading pressure on all cartridges.

A ring pin 52 (Figs. l1 and 12) mounted in the bolt is normally held incocked positionY by a spring 53. A pin 54 carried by the bolt andWorking in a slot 55 in the firing pin limits movement of the ring pin.

The ring pin is driven forwardly by a hammer 56 mounted on a pin 51carried by the bolt. The tail 58 of the hammer extends through a slot 59in the slide and through a slot 6D in the bottom plate 6 of thereceiver. 'The tail of the hammer carries at its extremity a roller 6Iwhich is adapted to strike the bottom plate at the rear end of the slot60 during retraction of the bolt and cause rotation of the hammer tococked position.

A separate'cocking piece 62 is preferably provided at the rear of theslot 68 and is mounted on a pivot pin 63 for rotation against the actionof a torsion spring 64. The cocking piece yieldingly takes the blow ofthe roller 6I upon return of the bolt to in battery position.

The hammer is formed with a notch 65 (Figs. 21 and 26) on one of itshubs whereby it is engaged by a shoulder 66 on a sear 61 (Figs. 22 and26) and held in cocked position. The sear is mounted on a pivot pin 68which is carried by the bolt in rear of the hammer and is normally heldin hammer-engaging position by a spring 69.

The front end of the sea'r is formed with a finger 19 extendinglaterally from the bolt and riding in a channel 1I (Fig. 8) in the leftside plate 5 of the receiver.

- The means for actuating the sear comprises a plunger (Figs. 2, 8, 27and 29) having a stem 12 disposed in a casing 13 mounted on the leftside plate 5 of the receiver and having a head 14 positioned above thecasing. A compression spring 15 which is also in torsion embraces thestem 12 and has its upper end anchored in the casing 13 and its lowerend seated on a collar 16 on the stem. The spring causes the lower endof the stem to project from the casing and holds the head 14 below theplane of the nger 10 of the sear.

The head 14 of the plunger includes an arm 11 having a cam face 18 and asecond arm 19, at right angles to the arm 11, and having a vertical face60. The arms are adapted to be moved through an aperture 8l in the sideplate of the receiver and perpendicular to the path oi.' movement of thesear. The head 14 of the plunger carries a pin 82 adapted to beselectively'engaged in'a narrow slot 83 (Fig. 9) or a Wide slot 84provided in spaced relation in the outer side of the casing 13, theadjustment being accomplished manually by lifting and then rotating theplunger.

When the arm 11 is disposed within the receiver, the pin 82 is engagedin the narrow slot arenoso 33 and the plunger is restricted to avertical movement. When the arm 'i3 is to be employed the pin 32 is inthe wide slot 3d and the plunger has a limited rotational movement aswell as a vertical movement.

A trigger bar 85 (Figs. 2 and 8) pivotally mounted by a pin S in abracket 3l is in engagement or is movable into engagement with the lowerend of the stem l2. Upon rotation of the trigger bar the gunner controlsthe plunger and elevates it to position of the appropriate arm 'il or 19depending on the adjustment, into the path of the finger 'l0 of thesear.

The arm Tl is employed for continuous or automatic ring, and when it iselevated the cam face 18 serves to trip the sear and release the hammerwhenever the bolt arrives in battery. The arm i9 is employed for singleshot and for synchronized firing and when it is elevated the nger of thesear Til strikes the vertical face 80 and rotates the arm forwardlyagainst the action of the torsion spring l5. Upon releasing the triggerbar the spring i depresses the plunger until the arm i9 is below theplane of the nger 'i0 and then rotates it into a position underneath thenger. In order to trip the sear it is necessary to actuate the triggerbar and elevate the plunger to bring the arm 'I9 into contact with thefinger 'iii of the sear.

The receiver is closed by a cover 88 (Fig. 17) having a plurality oftongues 89 on each side adapted to interlock with tongues 90 (Fig. 13)on the receiver. The front part of the cover constitutes the floor 90aof a cartridge feed-way and is symmetrical. Its side portions projectbeyond the receiver and terminate in downwardly inclined margins 9| tofacilitate entry of the cartridges either from the left or from theright.

A plate 92 (Figs. 6, 8 and 31) similar in shape to the floor 90a,constitutes the cover of the cartridge feed-way and is spaced from thefloor by supports 93 and 9d (Fig. 11) respectively at the front and rearof the iioor. The front end of the plate is formed with a pair ofrecesses 95--95 for engaging studs 96 in the front support 93 while therear end of the plate is secured by a latch 97 (Figs. 6 and 11) carriedby the rear support 9d. The rear support 94 is fixed to an ejector plate|00 forming part of the cover 88.

The cartridges 5| which are to be fed into the gun are carried in a beltwhich is of the disintegrating link type (Figs. 13 and 25) comprisingmetallic links 98 having an open side 99. The under side of the coverplate 92 is provided with a rail |00 (Figs. 8 and l2) whose rear Afacehas forwardly inclined extremities |0| and is adapted to guide the linksin their passage through the feed-Way.

A member |02 positioned on the upper side of the cover plate 92 and onthe longitudinal center thereof has a stud |03 on its rear end insertedin an aperture |00 in the cover plate and it also has a lug |05 on itsfront end inserted in an aperture |06 in the cover plate and rail |00.The lug |05 is normally projected into the feedway by a spring |0`|carried by the cover plate. The lug has a curved bottom face |08conforming to the curvature of the cartridge which it is adapted toengage when the cartridge is moved underneath the lug. The lug serves tohold the link 99 and strip it from the belt when the cartridge is pushedforwardly by the bolt.

The cover plate 92 is provided with a pair of apertures IGS-|09 spacedcentrally of the cover plate by the portion H0. At the outer end of eachof the apertures and on the upper side oi. the cover plate there isprovided a pin iii (Figs. 3, 13 and le) extending longitudinally of thecover plate and secured by pins or rivets Hifi-i i2. A belt-holding pawlH3 having an open bearing liti whereby it is mounted selectively oneither of the pins projects through the aperture |09 into the feedway. Aflat spring H5 having an open bearing H6 whereby it is mounted on theother pin projects through the other aperture |09, passes under theportion i I0 which serves as a fulcrum and has its opposite end engagedwith the upper side of the pawl H3 to yieldingly hld the pawl in place.The pawl and spring are easily and quickly reversed to provide foreither right hand or left hand feeding of the cartridge belt.

A flat spring (Figs. 11 and 32) positioned on the upper side of thecover plate in rear of the spring ||5 has a central U-shaped portion H8for engaging the upper rear part of the cartridge and holding it for theaction of the breech block when the bolt pushes the cartridge forwardly.

The cover 88 is formed with a central longitudinal opening ||9 (Fig. 17)extending from the front edge almost to the rear edge. This openingaccommodates a rib formed on the top of the breech bolt and adapted toengage the base of a'cartridge and push it forwardly out of the belt.The front portion of the opening which is in the fioor 90a of thefeed-way is of suflcient width to enable a cartridge to passtherethrough as it is being pushed into the chamber of the gun barrel.The front support 93 is provided with a beveled surface I2| (Fig. 12)for insuring the lowering of the cartridge during its forward movement.

The upper side of the iioor 90a is provided on opposite sides of theopening ||9 with dovetailed grooves |22|22 (Figs. 12 and 17). Acartridge stop member |23 mountable in either of the grooves accordingto the direction of feeding of the belt is provided With a plunger |26(Fig. 24) whose lower end is adapted to enter an aperture |25 in thefloor 90a. The plunger is normally depressed by a spring |26 and has ahead |27 engageable with the stop member to limit movement under theaction of the spring.

The rear portion of the floor 90a is formed With a pair of aperturesIZB- |28 (Fig. 17) on opposite sides of its center line. A belt feedpawl |29 (Figs. 13 and 14) adapted to project through either one of theapertures |28 according to its adjustment for right or left hand feedingis secured by a. pin |30 to the upper end of a feed lever |3I. The lever|3| is mounted on the receiver by means of a horizontally disposed pivotpin |32. The lower end of the lever carries a horizontally disposedroller |33 projecting through an aperture |30 in either one of the sideplates 5-5 of the receiver and directly engaging an inclined cam surface|35 formed on each side of the slide l. A spring |36 seated on the sideplate of the receiver and acting on the upper arm of the lever normallyholds the roller in engagement with the slide. Upon recoil movement ofthe slide the lever 3| is actuated and the belt-feed pawl |29 advancesthe belt through the feed-way. Upon counterrecoil movement of the slidethe pawl is retracted through the action of the spring |36 and reengagesthe belt preparatory to the next operation of feeding.

The lever |3| may be mounted on either side of the receiver. Theaperture |28 which is not in use is closed by a plate |31. A flat spring|38 secured to the plate |31 has an oii'set lower portion |39 adapted toenter and close the aperture |34 in the side plate and to thereby retainthe plate |31 in place.

The cover 88 having the longitudinal opening I9 is strengthened by meansof a plate |40 (Figs. 11 and 28) secured to the upper side of the coverand carries the rear support 94 forthe cover plate 92. The plate |40 hasa channel |4| to accommodate the ib |20 on the breech bolt. 'I'he plate|40 also has a pair of spaced ribs |42 depending through an aperture |43in the cover and serving to strike the upper part of the base of thecartridge case upon rearward movement of the breech bolt and eject thecase therefrom.

The front end of the bolt (Fig. 12) is formed with a tapered recess |44for receiving a floating extractor lever |45 having a hook |46 adjacentits forward end for engaging the rim of a cartridge. The hook has abeveled front face |41 whereby it may ride over the rim of a cartridgein the event the cartridge is loaded. into the barrel ahead of the boltand also to facilitate ejection of the empty case.

A stud |48 projecting from the upper face of the lever intermediate itsends enters a recess |49 in the bolt. A spring |50 is confined betweenVthe lower face of the lever and a hollow plug threadedly mounted in thebolt.

The front face of the bolt above the extractor lever is formed with aslot |52 (Fig. 9) for receiving the base of the cartridge as thecartridge is lowered from the feedway into the gun barrel.

As shown in Fig. 12 as the bolt reaches the end of its recoil stroke,the cartridge case strikes the ribs |42 on the plate |40. This actioncauses the cartridge case to be pivoted with considerable force aboutthe hook of the extractor lever and to be thrown downwardly and throughan opening |53 in the bottom plate 6 of the receiver. The extractorlever yields against the action of its spring and relieves the blow onthe mechamsm.

The rear end of the slide |4 and the bolt 38 are provided with aplurality of plungers respectively |54 and |55 (Figs. 11-14) which actas buffers and are adapted to strike the back plate |56 of the receiverto yieldingly check the recoil movement of these members. The back plateembraces the side plates of the receiver and is provided with tongues|51|51 (Figs. '1 and 8) fitting in corresponding grooves |58|58 in theoutside faces of the side plates. A latch |59 rotatably mounted on thebottom plate 6 of the receiver and held in position of adjustment by aflat spring |60 is movable through finger pieces |6| into and and out ofengagement with a groove |62 in the back plate.

In the drawings the reversibly mounted parts are` shown in position forleft-hand feeding of the cartridge belt. When the bolt is in battery,the belt feed pawl |29 is at the outer end of its stroke prepared toengage the first round of a cartridge belt inserted in the feedway.

In the initial loading operation the slide I4 is retracted by pulling onthe charging handle 29. During the first part of the movement the stud46 on the slide |4 moves from the front ends to the rear ends of the camslots 45 in the locking levers 39, thereby disengaging them from thereceiver and releasing the bolt. The bolt is now carried along by theslide I4 and both members are arrested by the back plate |58. During therecoil movement the hammer 56 is cocked and the belt feed pawl |29 movedthrough the lever |3| towards the axis of the gun to advance thecartridge belt and position the end round in front of the rib on thebolt.

On the counterrecoil stroke of the bolt and slide, the bolt pushes thecartridge out of the belt and into the chamber of the gun barrel, andthe slide |4 permits the belt feed pawl lever 3| to move outwardly underthe action of its spring |36. After the bolt is arrested by engaging thebarrel, the slide has an additional movement during which the stud 46rotates the locking levers 39 into engagement with the receiver. The gunis now loaded and is fired by acting on the trigger bar 85 to trip thesear 61 and release the hammer 56.

Upon firing the gun, the piston is driven rearwardly by the gases ofdischarge and the cycle of the parts is repeated. The charging handle 29is disconnected from the slide and remains stationary. In the automaticoperation resulting from firing a round, the empty cartridge case isWithdrawn from the gun barrel by the extractor |45 and is ejectedtherefrom by the ribs |42 on the cover 88.

I claim:

l. In a gun, a receiver having recesses with locking faces, a barrelattached to the receiver, a slide mounted for reciprocal movement in thereceiver, a breech bolt disposed in the receiver and supported on theslide, said bolt having recesses at opposite sides adjacent its frontend, a pair of locking levers carried by the bolt and each pivotallymounted at its front end for movement into and out of one of therecesses in the bolt and into one of the recesses in the receiver, eachlocking lever having an eccentric rear face engageable with the lockingface of the receiver, a crank arm on each lever and having a cam slot,and a stud on the slide inserted in the cam slot of each crank arm.

2. In a gun, a receiver, a barrel attached to the receiver, a slidemounted for reciprocal movement in the receiver, a breech bolt disposedin the receiver and supported on the slide, a pair of locking leverscarried by the bolt, each lever having an eccentric face engageable withthe receiver, a crank arm on each lever and haying a cam slot, and astud on the slide inserted in the cam slot of each arm.

3. In a gun, a receiver, a barrel attached to the receiver, a slidemounted for reciprocal movement .in the receiver, a breech bolt disposedin the receiver and supported on the slide, a pair of locking leverscarried by the bolt, each lever engageable with the receiver, a crankarm on each lever and having a cam slot, and a stud on the slideinserted in and having a loose t with respect to the cam slot of eacharm.

4. In a gun, a receiver, a barrel attached to the receiver, a breechbolt mounted for reciprocal movement in the receiver, a pair of lockinglevers carried by the bolt, each lever having an eccentric face forengaging the receiver, a crank arm on each lever and having a cam slot,and a slide having a stud inserted in the cam slots.

5. In a gun, a receiver, a reciprocating breech bolt in the receiver, asear carried by the bolt, a casing on the receiver, a plunger in thecasing, an arm on the upper end of the plunger and having acam face, asecond arm on the upper end of the plunger and having rectangular faces,a compression and torsion spring normally depressing the plunger so thatits lower end projects from the casing and the arms are out of the planeof the sear, means for restricting the plunger to a vertical movementwhen the arm with the cam face is positioned in the path of the sear,and means for restricting the plunger to a vertical movement and to alimited rotational movement when the second arm is positioned in thepath of the sear, and means for elevating the plunger.

6. In a gun, a receiver, a reciprocating breech bolt in the receiver, asear carried by the bolt, a plunger carried by the receiver, an arm onthe plunger having a cam face, a second arm on the plunger, a.compression and torsion spring normally depressing the plunger toposition the arms out of the plane of the sear, means for restrictingthe plunger to a vertical movement when the arm with the cam face is inthe path of the sear, and means for restricting the plunger to avertical movement and to a limited rotational movement when the secondarm is in the path of the sear.

'7. In a gun, a receiver, a cover for the receiver, the iront part ofthe cover constituting the floor of a cartridge feed-way and having anopening for passing a cartridge into the receiver, a front support and arear support on the oor part of the cover, a cover for the feedwaymounted on said support, and means for latching the cover in place.

8. In a gun having a cartridge belt feed-way, a cover for the feed-waycomprising a plate having a pair of spaced apertures, a pin positionedat the outer end of each of the apertures and on the upper side of theplate, a belt-holding pawl having an open bearing whereby it isselectively mounted on either of the pins, said pawl when so mountedprojecting through one of the apertures into the feed-Way, a fiat springhaving an open bearing whereby it is mounted on the other pin, saidspring when so mounted projecting through the other aperture andengaging the pawl.

9. In a gun having a cartridge belt feed-way, a cover for the feed-waycomprising a plate having a pair of spaced apertures, a pin positionedat the outer end of each of the apertures and on the upper side of theplate, a belt-holding pawl selectively mounted on either of the pins,said pawl when so mounted projecting through one of the apertures intothe feedway, a at spring mounted on the other pin, said spring when somounted projecting through the other aperture and engaging the pawl.

10. In a gun having a cartridge belt feed-way, a cover for the feed-wayhaving a centrally located opening, a member on the upper side of thecover and having a lug extending through the opening and adapted toserve as a linkstripper, and a spring yieldingly holding said member inplace.

11. In a gun having a cartridge feed-way, a floor for said feed-wayhaving an opening for passing a cartridge and -having grooves onopposite sides of the opening, a cartridge stop member selectivelymounted in the grooves of the floor, and a plunger carried by saidmember and engaging the oor.

12. In a gun having' a cartridge feed-way, a floor for said feed-wayhaving an opening for passing a cartridge and having grooves onopposit'e sides o! the opening. a cartridge stop member selectivelymounted in the grooves of the oor, and means for detachably holding thestop member in place.

13. In a gun, a receiver having side walls with openings, areciprocating member in the receiver having cam surfaces on oppositesides, a cover for the receiver provided with apertures on oppositesides of its center, a lever mountable on either side of the receiverand having one end movable through an opening in the wall of thereceiver for engagement with the cam surfaces of the reciprocatingmember, a spring normally holding the lever in such engagement, a pawlcarried by the other end of the lever and projecting through one of theapertures in the cover, a closure for the other aperture in the coverand a. spring carried by the closure and engageable in and closing theopening in the corresponding side wall of the receiver.

14. In a gun, a receiver, a reciprocating member in the receiver havingcam surfaces on opposite sides, a cover for the receiver provided withapertures on opposite sides of its center, a lever mountable on eitherside of the receiver, and having one end engageable with the camsurfaces of the reciprocating member, a spring normally holding thelever in engagement with said member, and a pawl carried by the otherend of said lever and projecting through one of the apertures in thecover.

15. In a gun, a receiver, a reciprocating member in the receiver andhaving a cam surface on its side wall, a cover for the receiver havingan aperture, a lever mounted on the receiver and having one endengageable with the cam surface of the reciprocating member, a springnormally holding the lever in such engagement, and a pawl carried by theother end of the lever and projecting through the aperture in the cover.

16. In a gun, a receiver, a cover for the receiver having alongitudinally extending opening, a breech bolt reciprocally mounted inthe receiver andhaving a rib on its upper side riding in the opening inthe cover, a plate secured to the cover and having a channel foraccommodating the rib on the breech bolt and means on said plateprojecting through the cover and serving to eject a cartridge from thebreech bolt upon recoil of said bolt.

17. In a gun, a receiver, a cover for the receiver having alongitudinally extending opening, a breech bolt reciprocally mounted inthe receiver and having a rib on its upper side riding in the opening inthe cover, a plate secured to the cover and having a channel foraccommodating the rib on the breech bolt.

18. In a gun, a receiver having recesses with curved faces, a barrelattached to the receiver, a breech bolt mounted for reciprocal movementin the receiver, a pair of locking levers pivotally mounted in the bolton opposite sides of the ing the locking levers.

l WILEY T. MQORE.

